Hi :wave: Making my first steps into julia, coming from R and python. Following the getting started guide, I noticed the following: 2^62 # 4611686018427387904 2^63 # <--- This is negative? # -9223372036854775808 2^63 > 1 # false 2^64 # 0 # this is zero, but that makes sense if it is a 64 bit float…

In Julia, 2 is an integer literal with 64 bits length. 2^63 overflows into the most signifant bit and thus is negative: julia> bitstring(2) "0000000000000000000000000000000000000000000000000000000000000010" julia> bitstring(2^32) "0000000000000000000000000000000100000000000000000000000000000000" …

Why is 2^63 negative?

New to Julia

ericphanson October 16, 2020, 7:38pm 4

Yep, that’s SafeInt64 from SaferIntegers.jl

13 Likes

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Why is 2^63 negative?

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